From 7e77855824882321f9c7034efa978a890d0af5d1 Mon Sep 17 00:00:00 2001
From: Guilherme Oenning <me@goenning.net>
Date: Mon, 20 Feb 2023 04:23:05 +0000
Subject: [PATCH] kubeconfig: deserialize null vectors as default (#1142)

deserialize null vectors as default

Signed-off-by: goenning <me@goenning.net>
Co-authored-by: Eirik A <sszynrae@gmail.com>
---
 kube-client/src/config/file_config.rs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/kube-client/src/config/file_config.rs b/kube-client/src/config/file_config.rs
index ff01857be..071173c17 100644
--- a/kube-client/src/config/file_config.rs
+++ b/kube-client/src/config/file_config.rs
@@ -25,14 +25,14 @@ pub struct Kubeconfig {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub preferences: Option<Preferences>,
     /// Referencable names to cluster configs
-    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
     pub clusters: Vec<NamedCluster>,
     /// Referencable names to user configs
     #[serde(rename = "users")]
-    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
     pub auth_infos: Vec<NamedAuthInfo>,
     /// Referencable names to context configs
-    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
     pub contexts: Vec<NamedContext>,
     /// The name of the context that you would like to use by default
     #[serde(rename = "current-context")]
@@ -152,6 +152,15 @@ where
     }
 }
 
+fn deserialize_null_as_default<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+where
+    T: Default + Deserialize<'de>,
+    D: Deserializer<'de>,
+{
+    let opt = Option::deserialize(deserializer)?;
+    Ok(opt.unwrap_or_default())
+}
+
 /// AuthInfo stores information to tell cluster who you are.
 #[derive(Clone, Debug, Serialize, Deserialize, Default)]
 pub struct AuthInfo {